mirror of
https://github.com/ethereum/go-ethereum.git
synced 2026-07-27 23:26:44 +00:00
accounts/abi: separate unpacking functions into own file and separate unpacking to methods and events
Signed-off-by: RJ Catalano <rj@monax.io>
This commit is contained in:
RJ Catalano
parent
a5be068035
commit
2615dc3887
4 changed files with 301 additions and 290 deletions
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@ -68,7 +68,7 @@ func (abi ABI) Pack(name string, args ...interface{}) ([]byte, error) {
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}
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method = m
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}
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arguments, err := method.pack(method, args...)
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arguments, err := method.pack(args...)
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if err != nil {
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return nil, err
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}
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@ -79,199 +79,6 @@ func (abi ABI) Pack(name string, args ...interface{}) ([]byte, error) {
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return append(method.Id(), arguments...), nil
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}
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// toGoSliceType parses the input and casts it to the proper slice defined by the ABI
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// argument in T.
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func toGoSlice(i int, t Argument, output []byte) (interface{}, error) {
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index := i * 32
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// The slice must, at very least be large enough for the index+32 which is exactly the size required
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// for the [offset in output, size of offset].
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if index+32 > len(output) {
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return nil, fmt.Errorf("abi: cannot marshal in to go slice: insufficient size output %d require %d", len(output), index+32)
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}
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elem := t.Type.Elem
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// first we need to create a slice of the type
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var refSlice reflect.Value
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switch elem.T {
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case IntTy, UintTy, BoolTy:
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// create a new reference slice matching the element type
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switch t.Type.Kind {
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case reflect.Bool:
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refSlice = reflect.ValueOf([]bool(nil))
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case reflect.Uint8:
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refSlice = reflect.ValueOf([]uint8(nil))
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case reflect.Uint16:
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refSlice = reflect.ValueOf([]uint16(nil))
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case reflect.Uint32:
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refSlice = reflect.ValueOf([]uint32(nil))
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case reflect.Uint64:
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refSlice = reflect.ValueOf([]uint64(nil))
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case reflect.Int8:
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refSlice = reflect.ValueOf([]int8(nil))
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case reflect.Int16:
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refSlice = reflect.ValueOf([]int16(nil))
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case reflect.Int32:
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refSlice = reflect.ValueOf([]int32(nil))
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case reflect.Int64:
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refSlice = reflect.ValueOf([]int64(nil))
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default:
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refSlice = reflect.ValueOf([]*big.Int(nil))
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}
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case AddressTy: // address must be of slice Address
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refSlice = reflect.ValueOf([]common.Address(nil))
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case HashTy: // hash must be of slice hash
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refSlice = reflect.ValueOf([]common.Hash(nil))
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case FixedBytesTy:
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refSlice = reflect.ValueOf([][]byte(nil))
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default: // no other types are supported
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return nil, fmt.Errorf("abi: unsupported slice type %v", elem.T)
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}
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var slice []byte
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var size int
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var offset int
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if t.Type.IsSlice {
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// get the offset which determines the start of this array ...
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offset = int(binary.BigEndian.Uint64(output[index+24 : index+32]))
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if offset+32 > len(output) {
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return nil, fmt.Errorf("abi: cannot marshal in to go slice: offset %d would go over slice boundary (len=%d)", len(output), offset+32)
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}
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slice = output[offset:]
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// ... starting with the size of the array in elements ...
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size = int(binary.BigEndian.Uint64(slice[24:32]))
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slice = slice[32:]
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// ... and make sure that we've at the very least the amount of bytes
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// available in the buffer.
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if size*32 > len(slice) {
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return nil, fmt.Errorf("abi: cannot marshal in to go slice: insufficient size output %d require %d", len(output), offset+32+size*32)
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}
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// reslice to match the required size
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slice = slice[:size*32]
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} else if t.Type.IsArray {
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//get the number of elements in the array
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size = t.Type.SliceSize
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//check to make sure array size matches up
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if index+32*size > len(output) {
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return nil, fmt.Errorf("abi: cannot marshal in to go array: offset %d would go over slice boundary (len=%d)", len(output), index+32*size)
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}
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//slice is there for a fixed amount of times
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slice = output[index : index+size*32]
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}
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for i := 0; i < size; i++ {
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var (
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inter interface{} // interface type
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returnOutput = slice[i*32 : i*32+32] // the return output
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)
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// set inter to the correct type (cast)
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switch elem.T {
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case IntTy, UintTy:
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inter = readInteger(t.Type.Kind, returnOutput)
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case BoolTy:
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inter = !allZero(returnOutput)
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case AddressTy:
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inter = common.BytesToAddress(returnOutput)
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case HashTy:
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inter = common.BytesToHash(returnOutput)
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case FixedBytesTy:
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inter = returnOutput
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}
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// append the item to our reflect slice
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refSlice = reflect.Append(refSlice, reflect.ValueOf(inter))
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}
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// return the interface
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return refSlice.Interface(), nil
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}
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func readInteger(kind reflect.Kind, b []byte) interface{} {
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switch kind {
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case reflect.Uint8:
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return uint8(b[len(b)-1])
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case reflect.Uint16:
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return binary.BigEndian.Uint16(b[len(b)-2:])
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case reflect.Uint32:
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return binary.BigEndian.Uint32(b[len(b)-4:])
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case reflect.Uint64:
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return binary.BigEndian.Uint64(b[len(b)-8:])
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case reflect.Int8:
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return int8(b[len(b)-1])
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case reflect.Int16:
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return int16(binary.BigEndian.Uint16(b[len(b)-2:]))
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case reflect.Int32:
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return int32(binary.BigEndian.Uint32(b[len(b)-4:]))
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case reflect.Int64:
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return int64(binary.BigEndian.Uint64(b[len(b)-8:]))
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default:
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return new(big.Int).SetBytes(b)
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}
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}
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func allZero(b []byte) bool {
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for _, byte := range b {
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if byte != 0 {
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return false
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}
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}
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return true
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}
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// toGoType parses the input and casts it to the proper type defined by the ABI
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// argument in T.
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func toGoType(i int, t Argument, output []byte) (interface{}, error) {
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// we need to treat slices differently
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if (t.Type.IsSlice || t.Type.IsArray) && t.Type.T != BytesTy && t.Type.T != StringTy && t.Type.T != FixedBytesTy && t.Type.T != FunctionTy {
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return toGoSlice(i, t, output)
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}
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index := i * 32
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if index+32 > len(output) {
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return nil, fmt.Errorf("abi: cannot marshal in to go type: length insufficient %d require %d", len(output), index+32)
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}
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// Parse the given index output and check whether we need to read
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// a different offset and length based on the type (i.e. string, bytes)
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var returnOutput []byte
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switch t.Type.T {
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case StringTy, BytesTy: // variable arrays are written at the end of the return bytes
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// parse offset from which we should start reading
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offset := int(binary.BigEndian.Uint64(output[index+24 : index+32]))
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if offset+32 > len(output) {
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return nil, fmt.Errorf("abi: cannot marshal in to go type: length insufficient %d require %d", len(output), offset+32)
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}
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// parse the size up until we should be reading
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size := int(binary.BigEndian.Uint64(output[offset+24 : offset+32]))
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if offset+32+size > len(output) {
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return nil, fmt.Errorf("abi: cannot marshal in to go type: length insufficient %d require %d", len(output), offset+32+size)
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}
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// get the bytes for this return value
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returnOutput = output[offset+32 : offset+32+size]
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default:
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returnOutput = output[index : index+32]
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}
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// convert the bytes to whatever is specified by the ABI.
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switch t.Type.T {
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case IntTy, UintTy:
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return readInteger(t.Type.Kind, returnOutput), nil
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case BoolTy:
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return !allZero(returnOutput), nil
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case AddressTy:
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return common.BytesToAddress(returnOutput), nil
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case HashTy:
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return common.BytesToHash(returnOutput), nil
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case BytesTy, FixedBytesTy, FunctionTy:
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return returnOutput, nil
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case StringTy:
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return string(returnOutput), nil
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}
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return nil, fmt.Errorf("abi: unknown type %v", t.Type.T)
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}
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// these variable are used to determine certain types during type assertion for
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// assignment.
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var (
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@ -282,108 +89,24 @@ var (
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)
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// Unpack output in v according to the abi specification
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func (abi ABI) Unpack(v interface{}, name string, output []byte) error {
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var isEvent bool
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// first look for name in the methods map, otherwise look in the events map, since there will
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// be a name collision for one ABI if there are two of the same names.
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// If we can't find it, error.
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method, ok := abi.Methods[name]
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if !ok {
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method, ok = abi.Events[name]
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if !ok {
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return fmt.Errorf("abi: could not find requested method or event %v", name)
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}
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isEvent = true
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}
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func (abi ABI) Unpack(v interface{}, name string, output []byte) (err error) {
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if len(output) == 0 {
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return fmt.Errorf("abi: unmarshalling empty output")
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}
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// make sure the passed value is a pointer
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valueOf := reflect.ValueOf(v)
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if reflect.Ptr != valueOf.Kind() {
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return fmt.Errorf("abi: Unpack(non-pointer %T)", v)
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}
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var (
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value = valueOf.Elem()
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typ = value.Type()
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)
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if len(method.Outputs) > 1 {
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switch value.Kind() {
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// struct will match named return values to the struct's field
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// names
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case reflect.Struct:
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for i := 0; i < len(method.Outputs); i++ {
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marshalledValue, err := toGoType(i, method.Outputs[i], output)
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if err != nil {
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return err
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}
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reflectValue := reflect.ValueOf(marshalledValue)
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for j := 0; j < typ.NumField(); j++ {
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field := typ.Field(j)
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// TODO read tags: `abi:"fieldName"`
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if field.Name == strings.ToUpper(method.Outputs[i].Name[:1])+method.Outputs[i].Name[1:] {
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if err := set(value.Field(j), reflectValue, method.Outputs[i]); err != nil {
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return err
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}
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}
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}
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}
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case reflect.Slice:
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if !value.Type().AssignableTo(r_interSlice) {
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return fmt.Errorf("abi: cannot marshal tuple in to slice %T (only []interface{} is supported)", v)
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}
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// if the slice already contains values, set those instead of the interface slice itself.
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if value.Len() > 0 {
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if len(method.Outputs) > value.Len() {
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return fmt.Errorf("abi: cannot marshal in to slices of unequal size (require: %v, got: %v)", len(method.Outputs), value.Len())
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}
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for i := 0; i < len(method.Outputs); i++ {
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marshalledValue, err := toGoType(i, method.Outputs[i], output)
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if err != nil {
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return err
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}
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reflectValue := reflect.ValueOf(marshalledValue)
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if err := set(value.Index(i).Elem(), reflectValue, method.Outputs[i]); err != nil {
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return err
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}
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}
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return nil
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}
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// create a new slice and start appending the unmarshalled
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// values to the new interface slice.
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z := reflect.MakeSlice(typ, 0, len(method.Outputs))
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for i := 0; i < len(method.Outputs); i++ {
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marshalledValue, err := toGoType(i, method.Outputs[i], output)
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if err != nil {
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return err
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}
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z = reflect.Append(z, reflect.ValueOf(marshalledValue))
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}
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value.Set(z)
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default:
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return fmt.Errorf("abi: cannot unmarshal tuple in to %v", typ)
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}
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// first look for name in the methods map, otherwise look in the events map, since there will
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// be a name collision for one ABI if there are two of the same names.
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// If we can't find it, error.
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if method, ok := abi.Methods[name]; ok {
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err = method.unpack(v, output)
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} else if event, ok := abi.Events[name]; ok {
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err = event.unpackLog(v, output)
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} else {
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marshalledValue, err := toGoType(0, method.Outputs[0], output)
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if err != nil {
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return err
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}
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if err := set(value, reflect.ValueOf(marshalledValue), method.Outputs[0]); err != nil {
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return err
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}
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err = fmt.Errorf("abi: could not find requested method or event %v", name)
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}
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return nil
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return
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}
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func (abi *ABI) UnmarshalJSON(data []byte) error {
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@ -39,7 +39,7 @@ type Method struct {
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Outputs []Argument
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}
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func (m Method) pack(method Method, args ...interface{}) ([]byte, error) {
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func (method Method) pack(args ...interface{}) ([]byte, error) {
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// Make sure arguments match up and pack them
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if len(args) != len(method.Inputs) {
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return nil, fmt.Errorf("argument count mismatch: %d for %d", len(args), len(method.Inputs))
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@ -77,6 +77,91 @@ func (m Method) pack(method Method, args ...interface{}) ([]byte, error) {
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return ret, nil
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}
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func (method Method) unpack(v interface{}, output []byte) error {
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// make sure the passed value is a pointer
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valueOf := reflect.ValueOf(v)
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if reflect.Ptr != valueOf.Kind() {
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return fmt.Errorf("abi: Unpack(non-pointer %T)", v)
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}
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var (
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value = valueOf.Elem()
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typ = value.Type()
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)
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if len(method.Outputs) > 1 {
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switch value.Kind() {
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// struct will match named return values to the struct's field
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// names
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case reflect.Struct:
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for i := 0; i < len(method.Outputs); i++ {
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marshalledValue, err := toGoType(i, method.Outputs[i], output)
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if err != nil {
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return err
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}
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reflectValue := reflect.ValueOf(marshalledValue)
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for j := 0; j < typ.NumField(); j++ {
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field := typ.Field(j)
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// TODO read tags: `abi:"fieldName"`
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if field.Name == strings.ToUpper(method.Outputs[i].Name[:1])+method.Outputs[i].Name[1:] {
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if err := set(value.Field(j), reflectValue, method.Outputs[i]); err != nil {
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return err
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}
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}
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}
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}
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case reflect.Slice:
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if !value.Type().AssignableTo(r_interSlice) {
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return fmt.Errorf("abi: cannot marshal tuple in to slice %T (only []interface{} is supported)", v)
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}
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// if the slice already contains values, set those instead of the interface slice itself.
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if value.Len() > 0 {
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if len(method.Outputs) > value.Len() {
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return fmt.Errorf("abi: cannot marshal in to slices of unequal size (require: %v, got: %v)", len(method.Outputs), value.Len())
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}
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for i := 0; i < len(method.Outputs); i++ {
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marshalledValue, err := toGoType(i, method.Outputs[i], output)
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if err != nil {
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return err
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}
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reflectValue := reflect.ValueOf(marshalledValue)
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if err := set(value.Index(i).Elem(), reflectValue, method.Outputs[i]); err != nil {
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return err
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}
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}
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return nil
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}
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// create a new slice and start appending the unmarshalled
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// values to the new interface slice.
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z := reflect.MakeSlice(typ, 0, len(method.Outputs))
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for i := 0; i < len(method.Outputs); i++ {
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marshalledValue, err := toGoType(i, method.Outputs[i], output)
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if err != nil {
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return err
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}
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z = reflect.Append(z, reflect.ValueOf(marshalledValue))
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}
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value.Set(z)
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default:
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return fmt.Errorf("abi: cannot unmarshal tuple in to %v", typ)
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}
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} else {
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marshalledValue, err := toGoType(0, method.Outputs[0], output)
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if err != nil {
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return err
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}
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if err := set(value, reflect.ValueOf(marshalledValue), method.Outputs[0]); err != nil {
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return err
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}
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}
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}
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// Sig returns the methods string signature according to the ABI spec.
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//
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// Example
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|
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@ -54,8 +54,9 @@ func reflectIntKind(unsigned bool, size int) reflect.Kind {
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return reflect.Uint64
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}
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return reflect.Int64
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default:
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return reflect.Ptr
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}
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return reflect.Ptr
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}
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// mustArrayToBytesSlice creates a new byte slice with the exact same size as value
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202
accounts/abi/unpacking.go
Normal file
202
accounts/abi/unpacking.go
Normal file
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@ -0,0 +1,202 @@
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package abi
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import (
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"encoding/binary"
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"fmt"
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"reflect"
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"github.com/ethereum/go-ethereum/common"
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)
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// toGoSliceType parses the input and casts it to the proper slice defined by the ABI
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// argument in T.
|
||||
func toGoSlice(i int, t Argument, output []byte) (interface{}, error) {
|
||||
index := i * 32
|
||||
// The slice must, at very least be large enough for the index+32 which is exactly the size required
|
||||
// for the [offset in output, size of offset].
|
||||
if index+32 > len(output) {
|
||||
return nil, fmt.Errorf("abi: cannot marshal in to go slice: insufficient size output %d require %d", len(output), index+32)
|
||||
}
|
||||
elem := t.Type.Elem
|
||||
|
||||
// first we need to create a slice of the type
|
||||
var refSlice reflect.Value
|
||||
switch elem.T {
|
||||
case IntTy, UintTy, BoolTy:
|
||||
// create a new reference slice matching the element type
|
||||
switch t.Type.Kind {
|
||||
case reflect.Bool:
|
||||
refSlice = reflect.ValueOf([]bool(nil))
|
||||
case reflect.Uint8:
|
||||
refSlice = reflect.ValueOf([]uint8(nil))
|
||||
case reflect.Uint16:
|
||||
refSlice = reflect.ValueOf([]uint16(nil))
|
||||
case reflect.Uint32:
|
||||
refSlice = reflect.ValueOf([]uint32(nil))
|
||||
case reflect.Uint64:
|
||||
refSlice = reflect.ValueOf([]uint64(nil))
|
||||
case reflect.Int8:
|
||||
refSlice = reflect.ValueOf([]int8(nil))
|
||||
case reflect.Int16:
|
||||
refSlice = reflect.ValueOf([]int16(nil))
|
||||
case reflect.Int32:
|
||||
refSlice = reflect.ValueOf([]int32(nil))
|
||||
case reflect.Int64:
|
||||
refSlice = reflect.ValueOf([]int64(nil))
|
||||
default:
|
||||
refSlice = reflect.ValueOf([]*big.Int(nil))
|
||||
}
|
||||
case AddressTy: // address must be of slice Address
|
||||
refSlice = reflect.ValueOf([]common.Address(nil))
|
||||
case HashTy: // hash must be of slice hash
|
||||
refSlice = reflect.ValueOf([]common.Hash(nil))
|
||||
case FixedBytesTy:
|
||||
refSlice = reflect.ValueOf([][]byte(nil))
|
||||
default: // no other types are supported
|
||||
return nil, fmt.Errorf("abi: unsupported slice type %v", elem.T)
|
||||
}
|
||||
|
||||
var slice []byte
|
||||
var size int
|
||||
var offset int
|
||||
if t.Type.IsSlice {
|
||||
// get the offset which determines the start of this array ...
|
||||
offset = int(binary.BigEndian.Uint64(output[index+24 : index+32]))
|
||||
if offset+32 > len(output) {
|
||||
return nil, fmt.Errorf("abi: cannot marshal in to go slice: offset %d would go over slice boundary (len=%d)", len(output), offset+32)
|
||||
}
|
||||
|
||||
slice = output[offset:]
|
||||
// ... starting with the size of the array in elements ...
|
||||
size = int(binary.BigEndian.Uint64(slice[24:32]))
|
||||
slice = slice[32:]
|
||||
// ... and make sure that we've at the very least the amount of bytes
|
||||
// available in the buffer.
|
||||
if size*32 > len(slice) {
|
||||
return nil, fmt.Errorf("abi: cannot marshal in to go slice: insufficient size output %d require %d", len(output), offset+32+size*32)
|
||||
}
|
||||
|
||||
// reslice to match the required size
|
||||
slice = slice[:size*32]
|
||||
} else if t.Type.IsArray {
|
||||
//get the number of elements in the array
|
||||
size = t.Type.SliceSize
|
||||
|
||||
//check to make sure array size matches up
|
||||
if index+32*size > len(output) {
|
||||
return nil, fmt.Errorf("abi: cannot marshal in to go array: offset %d would go over slice boundary (len=%d)", len(output), index+32*size)
|
||||
}
|
||||
//slice is there for a fixed amount of times
|
||||
slice = output[index : index+size*32]
|
||||
}
|
||||
|
||||
for i := 0; i < size; i++ {
|
||||
var (
|
||||
inter interface{} // interface type
|
||||
returnOutput = slice[i*32 : i*32+32] // the return output
|
||||
)
|
||||
// set inter to the correct type (cast)
|
||||
switch elem.T {
|
||||
case IntTy, UintTy:
|
||||
inter = readInteger(t.Type.Kind, returnOutput)
|
||||
case BoolTy:
|
||||
inter = !allZero(returnOutput)
|
||||
case AddressTy:
|
||||
inter = common.BytesToAddress(returnOutput)
|
||||
case HashTy:
|
||||
inter = common.BytesToHash(returnOutput)
|
||||
case FixedBytesTy:
|
||||
inter = returnOutput
|
||||
}
|
||||
// append the item to our reflect slice
|
||||
refSlice = reflect.Append(refSlice, reflect.ValueOf(inter))
|
||||
}
|
||||
|
||||
// return the interface
|
||||
return refSlice.Interface(), nil
|
||||
}
|
||||
|
||||
func readInteger(kind reflect.Kind, b []byte) interface{} {
|
||||
switch kind {
|
||||
case reflect.Uint8:
|
||||
return uint8(b[len(b)-1])
|
||||
case reflect.Uint16:
|
||||
return binary.BigEndian.Uint16(b[len(b)-2:])
|
||||
case reflect.Uint32:
|
||||
return binary.BigEndian.Uint32(b[len(b)-4:])
|
||||
case reflect.Uint64:
|
||||
return binary.BigEndian.Uint64(b[len(b)-8:])
|
||||
case reflect.Int8:
|
||||
return int8(b[len(b)-1])
|
||||
case reflect.Int16:
|
||||
return int16(binary.BigEndian.Uint16(b[len(b)-2:]))
|
||||
case reflect.Int32:
|
||||
return int32(binary.BigEndian.Uint32(b[len(b)-4:]))
|
||||
case reflect.Int64:
|
||||
return int64(binary.BigEndian.Uint64(b[len(b)-8:]))
|
||||
default:
|
||||
return new(big.Int).SetBytes(b)
|
||||
}
|
||||
}
|
||||
|
||||
func allZero(b []byte) bool {
|
||||
for _, byte := range b {
|
||||
if byte != 0 {
|
||||
return false
|
||||
}
|
||||
}
|
||||
return true
|
||||
}
|
||||
|
||||
// toGoType parses the input and casts it to the proper type defined by the ABI
|
||||
// argument in T.
|
||||
func toGoType(i int, t Argument, output []byte) (interface{}, error) {
|
||||
// we need to treat slices differently
|
||||
if (t.Type.IsSlice || t.Type.IsArray) && t.Type.T != BytesTy && t.Type.T != StringTy && t.Type.T != FixedBytesTy && t.Type.T != FunctionTy {
|
||||
return toGoSlice(i, t, output)
|
||||
}
|
||||
|
||||
index := i * 32
|
||||
if index+32 > len(output) {
|
||||
return nil, fmt.Errorf("abi: cannot marshal in to go type: length insufficient %d require %d", len(output), index+32)
|
||||
}
|
||||
|
||||
// Parse the given index output and check whether we need to read
|
||||
// a different offset and length based on the type (i.e. string, bytes)
|
||||
var returnOutput []byte
|
||||
switch t.Type.T {
|
||||
case StringTy, BytesTy: // variable arrays are written at the end of the return bytes
|
||||
// parse offset from which we should start reading
|
||||
offset := int(binary.BigEndian.Uint64(output[index+24 : index+32]))
|
||||
if offset+32 > len(output) {
|
||||
return nil, fmt.Errorf("abi: cannot marshal in to go type: length insufficient %d require %d", len(output), offset+32)
|
||||
}
|
||||
// parse the size up until we should be reading
|
||||
size := int(binary.BigEndian.Uint64(output[offset+24 : offset+32]))
|
||||
if offset+32+size > len(output) {
|
||||
return nil, fmt.Errorf("abi: cannot marshal in to go type: length insufficient %d require %d", len(output), offset+32+size)
|
||||
}
|
||||
|
||||
// get the bytes for this return value
|
||||
returnOutput = output[offset+32 : offset+32+size]
|
||||
default:
|
||||
returnOutput = output[index : index+32]
|
||||
}
|
||||
|
||||
// convert the bytes to whatever is specified by the ABI.
|
||||
switch t.Type.T {
|
||||
case IntTy, UintTy:
|
||||
return readInteger(t.Type.Kind, returnOutput), nil
|
||||
case BoolTy:
|
||||
return !allZero(returnOutput), nil
|
||||
case AddressTy:
|
||||
return common.BytesToAddress(returnOutput), nil
|
||||
case HashTy:
|
||||
return common.BytesToHash(returnOutput), nil
|
||||
case BytesTy, FixedBytesTy, FunctionTy:
|
||||
return returnOutput, nil
|
||||
case StringTy:
|
||||
return string(returnOutput), nil
|
||||
}
|
||||
return nil, fmt.Errorf("abi: unknown type %v", t.Type.T)
|
||||
}
|
||||
Loading…
Reference in a new issue